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6. Close the Low Pressure side of the manifold gauge, and turn off the vacuum pump.
7. Wait for 5 minutes, then check that there has been no change in system pressure.
8. If there is a change in system pressure, refer to Gas Leak Check section for information on how to
check for leaks. If there is no change in system pressure, unscrew the cap from the packed valve
(high pressure valve).
9. Insert hexagonal wrench into the packed valve (high pressure valve) and open the valve by turning
the wrench in a 1/4counterclockwise turn. Listen for gas to exit the system, then close the valve after
5 seconds.
10.Watch the Pressure Gauge for one minute to make sure that there is no change in pressure. The
Pressure Gauge should read slightly higher than atmospheric pressure.
11.Remove the charge hose from the service port.
12.Using hexagonal wrench, fully open both the high pressure and low pressure valves.
13.Tighten valve caps on all three valves (service port, high pressure, low pressure) by hand. You
may tighten it further using a torque wrench if needed.
4.3.5 Additional refrigerant charging
Some systems require additional charging depending on pipe lengths. The standard pipe length varies
according to local regulations. The standard pipe length is 5m (16‘). The additional refrigerant to be
charged can be calculated using the following formula:
Liquid pipe: Φ6.35mm
Additional refrigerant charging = (Pipe length – standard length) *15g/m
Liquid pipe: Φ9.52mm
Additional refrigerant charging = (Pipe length – standard length) * 30g/m
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